Auto merge of #53815 - F001:if-let-guard, r=petrochenkov

[rust.git] / src / librustc / hir / lowering.rs

diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs
index cb05f7b44c3b96b783b3ed13fc2495324f421c08..34b3eb0a8c8bf64d1fd595377f2f028d89dcaf3f 100644 (file)
--- a/src/librustc/hir/lowering.rs
+++ b/src/librustc/hir/lowering.rs
@@ -50,6 +50,7 @@
 use lint::builtin::{self, PARENTHESIZED_PARAMS_IN_TYPES_AND_MODULES,
                     ELIDED_LIFETIMES_IN_PATHS};
 use middle::cstore::CrateStore;
+use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::indexed_vec::IndexVec;
 use rustc_data_structures::small_vec::OneVector;
 use rustc_data_structures::thin_vec::ThinVec;
@@ -57,7 +58,7 @@
 use util::common::FN_OUTPUT_NAME;
 use util::nodemap::{DefIdMap, NodeMap};
 
-use std::collections::{BTreeMap, HashSet};
+use std::collections::BTreeMap;
 use std::fmt::Debug;
 use std::iter;
 use std::mem;
@@ -1053,7 +1054,10 @@ fn lower_arm(&mut self, arm: &Arm) -> hir::Arm {
         hir::Arm {
             attrs: self.lower_attrs(&arm.attrs),
             pats: arm.pats.iter().map(|x| self.lower_pat(x)).collect(),
-            guard: arm.guard.as_ref().map(|ref x| P(self.lower_expr(x))),
+            guard: match arm.guard {
+                Some(Guard::If(ref x)) => Some(hir::Guard::If(P(self.lower_expr(x)))),
+                _ => None,
+            },
             body: P(self.lower_expr(&arm.body)),
         }
     }
@@ -1342,7 +1346,7 @@ struct ImplTraitLifetimeCollector<'r, 'a: 'r> {
             exist_ty_id: NodeId,
             collect_elided_lifetimes: bool,
             currently_bound_lifetimes: Vec<hir::LifetimeName>,
-            already_defined_lifetimes: HashSet<hir::LifetimeName>,
+            already_defined_lifetimes: FxHashSet<hir::LifetimeName>,
             output_lifetimes: Vec<hir::GenericArg>,
             output_lifetime_params: Vec<hir::GenericParam>,
         }
@@ -1476,7 +1480,7 @@ fn visit_lifetime(&mut self, lifetime: &'v hir::Lifetime) {
             exist_ty_id,
             collect_elided_lifetimes: true,
             currently_bound_lifetimes: Vec::new(),
-            already_defined_lifetimes: HashSet::new(),
+            already_defined_lifetimes: FxHashSet::default(),
             output_lifetimes: Vec::new(),
             output_lifetime_params: Vec::new(),
         };